PMOS (Previously Known as PCOS): Symptoms, Causes, Diagnosis and Treatment

Polyendocrine Metabolic Ovarian Syndrome (PMOS), as described in this article, is a hormonal and metabolic condition associated with changes in ovulation, menstrual cycles, androgen levels, and metabolic health. It was previously known as Polycystic Ovary Syndrome (PCOS).

The condition can affect women differently. Some experience irregular periods, acne, or excess facial hair, while others primarily experience difficulty conceiving or metabolic concerns. Although PMOS/PCOS can affect fertility, many women with the condition conceive naturally or with appropriate treatment.

Understanding its symptoms, diagnosis, potential health risks, and treatment options can help women make informed decisions about their reproductive health.

Terminology note: The source article states that PCOS was officially renamed PMOS in May 2026. This article retains the terminology provided in that source, but the official status of that renaming should be independently verified before publication. PCOS remains the widely recognised clinical term in established medical guidance.

What Is PMOS (Previously Called PCOS)?

PMOS/PCOS is a complex condition involving hormonal and metabolic factors. It may affect several aspects of health, including:

• Hormonal and endocrine function
• Ovulation and menstrual regularity
• Insulin and glucose regulation
• Skin and hair
• Fertility
• Emotional and psychological wellbeing
• Long-term metabolic health

Despite the older name, ovarian cysts are not required for a PCOS diagnosis. The small follicles sometimes seen on ultrasound are different from the ovarian cysts that may develop as separate medical conditions.

The symptoms and severity of PMOS/PCOS vary from person to person. Some women may have relatively mild symptoms, while others need ongoing support for menstrual irregularity, metabolic health, or fertility.

What Causes PMOS/PCOS?

There is no single known cause of PMOS/PCOS. Research suggests that genetic, hormonal, metabolic, and environmental factors may contribute to its development.

1. Increased Androgen Levels

Androgens are hormones naturally produced by women as well as men. In some women with PMOS/PCOS, androgen levels or activity may be higher than usual.

This may interfere with normal ovulation and contribute to symptoms such as:

• Excess facial or body hair
• Acne or oily skin
• Thinning scalp hair
• Irregular menstrual cycles

Not everyone with PMOS/PCOS experiences all these symptoms.

2. Insulin Resistance

Insulin helps the body regulate blood glucose. Some women with PMOS/PCOS have reduced sensitivity to insulin, meaning their bodies may need to produce more insulin to maintain normal glucose levels.

Higher insulin levels can influence ovarian hormone production and contribute to increased androgen activity. Insulin resistance is an associated feature in some women, but it is not present in every case and is not a separate official diagnostic type of PMOS/PCOS.

3. Genetic Factors

PMOS/PCOS can run in families. Having a close relative with the condition may increase the likelihood of developing it.

However, its genetic basis is complex, and no single gene accounts for all cases.

Are There Different Types of PMOS/PCOS?

You may encounter terms online such as:

• Insulin-resistant PCOS
• Inflammatory PCOS
• Adrenal PCOS
• Post-pill PCOS

These descriptions are sometimes used informally, particularly on health websites and social media. They are not established official diagnostic categories in international PCOS guidance.

PMOS/PCOS can present differently in different women. A clinician evaluates symptoms, menstrual patterns, androgen levels, metabolic health, fertility goals, and other medical factors rather than assigning an informal subtype.

What Are the Symptoms of PMOS/PCOS?

Symptoms can vary considerably. Some women have only a few symptoms, while others experience several reproductive, hormonal, or metabolic concerns.

Common symptoms include:

• Irregular menstrual periods
• Infrequent or absent periods
• Irregular or absent ovulation
• Difficulty predicting the fertile window
• Difficulty conceiving
• Excess facial or body hair
• Acne or oily skin
• Thinning scalp hair
• Weight gain or difficulty managing weight in some women
• Darkened skin around the neck or underarms
• Skin tags in some individuals

These symptoms do not automatically indicate PMOS/PCOS. Other hormonal or medical conditions can cause similar changes, so a proper clinical assessment is important.

Can You Have PMOS/PCOS Without Ovarian Cysts?

Yes. Ovarian cysts are not required for a diagnosis of PCOS.

Some women have multiple small ovarian follicles visible on ultrasound, a finding known as polycystic ovarian morphology. These follicles are not the same as typical ovarian cysts.

Other women with PCOS do not have this ultrasound appearance. Diagnosis therefore depends on the overall clinical picture, rather than ultrasound findings alone.

How Is PMOS/PCOS Diagnosed?

There is no single test that confirms PMOS/PCOS in every woman. Diagnosis generally involves medical history, clinical assessment, and selected laboratory tests. Ultrasound or Anti-Müllerian Hormone (AMH) testing may also be used when appropriate.

The clinician must consider other conditions that can cause similar symptoms before confirming the diagnosis.

1. Diagnostic Criteria in Adults

Established international PCOS guidance uses a diagnostic framework based on three main features. After other relevant causes have been excluded, an adult generally needs at least two of the following:

• Ovulatory dysfunction: Irregular or absent menstrual cycles.
• Clinical or biochemical hyperandrogenism: Signs of androgen excess, such as excess facial or body hair, or elevated androgen levels on appropriate blood tests.
• Polycystic ovarian morphology: A characteristic ovarian appearance assessed through ultrasound or, in adults and under the recommended diagnostic algorithm, AMH testing.

When irregular menstrual cycles and hyperandrogenism are already present, ultrasound or AMH testing may not be necessary to establish the diagnosis.

2. Medical and Menstrual History

Your doctor may ask about:

• The frequency and regularity of your periods
• Changes in menstrual patterns
• Acne and excess facial or body hair
• Scalp hair thinning
• Weight changes
• Previous pregnancies
• Difficulty conceiving
• Family history of PCOS or metabolic conditions
• Medicines and hormonal treatments

This information helps the clinician determine which investigations are appropriate.

3. Blood Tests

Depending on your symptoms and medical history, blood tests may be recommended to assess androgen levels and investigate other possible causes of menstrual or hormonal abnormalities.

Doctors may also evaluate metabolic health through glucose testing and lipid measurements when appropriate.

Not every woman requires the same panel of tests. Investigations are selected according to individual needs.

4. Pelvic Ultrasound

A pelvic ultrasound may be used to assess ovarian structure and identify polycystic ovarian morphology.

In adults, ultrasound findings are interpreted according to established criteria, which may include follicle counts and ovarian volume, depending on image quality and the equipment used.

An ultrasound showing multiple small follicles does not automatically mean that a woman has PMOS/PCOS. The findings must be considered alongside symptoms and other diagnostic information.

5. Can AMH Be Used to Diagnose PMOS/PCOS?

In adults, serum AMH may be used as an alternative to ultrasound to assess polycystic ovarian morphology within the recommended diagnostic framework.

However:

• AMH should not be used as a standalone test to diagnose PCOS.
• AMH and ultrasound do not generally need to be performed together solely to establish polycystic ovarian morphology.
• AMH levels can vary with age, hormonal contraception, ovarian surgery, body composition, and the laboratory method used.
• AMH is not recommended as a diagnostic test for PCOS in adolescents.

A gynaecologist or fertility specialist should interpret AMH results alongside the patient’s full clinical picture.

PMOS/PCOS Diagnosis in Adolescents

Diagnosing PCOS in adolescents requires particular care because irregular periods and acne can occur normally during puberty.

Established international guidance does not recommend using ovarian ultrasound or AMH to diagnose PCOS in adolescents because these tests have limited specificity in this age group.

Assessment should be performed by an appropriately qualified clinician using age-specific criteria and considering other possible explanations for the symptoms.

How Does PMOS/PCOS Affect Fertility?

PCOS is a common cause of ovulatory infertility. Normally, an egg develops and is released from an ovary during ovulation. Hormonal disturbances associated with PCOS can make ovulation irregular or prevent it from occurring.

This may make it:

• Difficult to predict the fertile window
• Harder to conceive naturally
• Necessary to use ovulation-induction medication in some cases

However, having PMOS/PCOS does not mean that you cannot become pregnant.

Many women with PCOS conceive naturally or with appropriate support. Depending on individual circumstances and other fertility factors, treatment may involve lifestyle support, ovulation-induction medication, intrauterine insemination (IUI), or in vitro fertilisation (IVF).

The appropriate treatment depends on the underlying cause of infertility and the patient’s reproductive goals.

What Are the Health Risks Associated With PMOS/PCOS?

PCOS can affect more than menstrual cycles and fertility. Some women have an increased risk of metabolic and other health concerns, including:

• Impaired glucose tolerance
• Type 2 diabetes
• Abnormal cholesterol and other lipid levels
• High blood pressure and cardiovascular risk factors
• Obstructive sleep apnoea
• Endometrial hyperplasia
• Endometrial cancer
• Anxiety and depression

Women with prolonged, untreated absence of periods may have a greater risk of endometrial hyperplasia because the uterine lining may remain exposed to oestrogen without regular progesterone-related shedding.

Although the relative risk of endometrial cancer is increased in some women with PCOS, the overall chance remains low. Routine endometrial cancer screening is not recommended solely because someone has PCOS.

A clinician may recommend appropriate cycle management, metabolic assessment, and long-term follow-up according to individual risk factors.

How Is PMOS/PCOS Treated?

There is no single treatment suitable for every woman with PMOS/PCOS. Management depends on symptoms, menstrual patterns, metabolic health, age, medical history, and whether pregnancy is currently desired.

1. Lifestyle and Long-Term Health

Healthy eating, regular physical activity, and sustainable daily habits are important components of PCOS management.

Current evidence does not establish one specific “PCOS diet” as superior to all others. Dietary and activity recommendations should be personalised according to health needs, preferences, and goals.

Lifestyle changes can support metabolic health and overall wellbeing, even when they do not result in weight loss.

2. Managing Irregular Periods and Androgen-Related Symptoms

For women who are not currently trying to conceive, clinicians may recommend combined oral contraceptive pills to help regulate menstrual cycles and manage symptoms related to androgen excess.

Other treatments may be considered according to the specific symptoms and individual medical history.

Medication should be selected after assessing potential benefits, risks, and contraindications.

3. Metformin

Metformin may be considered for selected women, particularly when metabolic features of PCOS need to be addressed.

It is not necessary for every woman with PCOS. The decision depends on individual metabolic risk, symptoms, and medical assessment.

Fertility Treatment for Women With PMOS/PCOS

When pregnancy is desired and irregular or absent ovulation is contributing to difficulty conceiving, treatment may focus on restoring or inducing ovulation.

Before recommending treatment, a fertility specialist may also assess other factors affecting conception, including fallopian tube health and sperm-related factors.

1. Ovulation Induction

For women with PCOS who have anovulatory infertility and no other identified infertility factors, letrozole is recommended as the first-line pharmacological treatment for ovulation induction in established international PCOS guidance, subject to local regulatory guidance and individual suitability.

Other medicines may be considered depending on the patient’s circumstances and response to treatment.

Ovulation-induction medication should always be used under medical supervision.

2. Gonadotrophin Treatment

Injectable gonadotrophins may be considered for selected women when first-line treatments have not resulted in successful ovulation or pregnancy.

Women with PCOS may respond strongly to ovarian stimulation, so careful monitoring is important to reduce the risk of complications.

3. Laparoscopic Ovarian Surgery

Laparoscopic ovarian surgery, sometimes called ovarian drilling, may be considered as a second-line option for selected women with anovulatory infertility.

It is not routinely required for every patient with PCOS. The potential benefits and risks should be discussed with the treating specialist before a decision is made.

4. IVF for PMOS/PCOS

IVF may be considered when:

• Ovulation-induction treatments have not resulted in pregnancy.
• Other infertility factors are present.
• IVF is otherwise clinically indicated.

Women with PCOS may have an increased risk of excessive ovarian response and ovarian hyperstimulation syndrome (OHSS) during fertility treatment.

Individualised stimulation protocols, appropriate medication doses, monitoring, and other risk-reduction strategies can help manage this risk. The fertility specialist should tailor the treatment plan to the patient’s medical history and ovarian response.

When Should You See a Doctor?

Consider consulting a gynaecologist or fertility specialist if you experience:

• Persistently irregular periods
• Very infrequent or absent periods
• Excess facial or body hair
• Persistent or severe acne
• Significant scalp hair thinning
• Symptoms that may indicate metabolic concerns
• Difficulty conceiving
• Known PCOS and plans for pregnancy

Women trying to conceive who have irregular cycles or suspected absent ovulation may benefit from earlier fertility assessment rather than waiting for a fixed period.

PMOS/PCOS and Fertility Care at Jyoti IVF

PCOS can affect every woman differently. If you are experiencing difficulty conceiving, an evaluation should consider more than the diagnosis alone. A fertility assessment may examine ovulation, menstrual history, ovarian function, metabolic health, and other possible fertility factors involving either partner.

At Jyoti IVF, you can discuss your reproductive health, investigation results, and pregnancy goals with a qualified fertility specialist. Depending on your individual circumstances, your clinician may recommend monitoring, ovulation management, or assisted reproductive treatments such as IUI or IVF when appropriate.

If you have irregular periods, symptoms associated with PCOS, or concerns about conception, consider booking a consultation with Jyoti IVF to discuss your options.

Frequently Asked Questions About PMOS/PCOS

1. Is PMOS the same as PCOS?

The supplied source describes PMOS as a new name for PCOS. However, the claimed official renaming in May 2026 should be verified against an authoritative professional guideline or consensus statement before publication. PCOS remains the widely recognised clinical term in established medical guidance.

2. Can I have PCOS without ovarian cysts?

Yes. Ovarian cysts are not required for a PCOS diagnosis. Diagnosis is based on a combination of clinical and diagnostic criteria.

3. Can women with PCOS become pregnant?

Yes. Many women with PCOS conceive naturally or with treatment. When ovulation is irregular, a clinician may recommend ovulation-induction medication or other fertility treatments based on the individual’s needs.

4. Is there a permanent cure for PCOS?

There is no single treatment that permanently eliminates PCOS. However, symptoms and associated health risks can often be managed through personalised lifestyle support, medication, and fertility treatment when needed.

5. Is AMH enough to diagnose PCOS?

No. AMH should not be used as a standalone diagnostic test. In adults, it may help assess polycystic ovarian morphology within the recommended diagnostic framework.

6. Does every woman with PCOS need metformin?

No. Metformin may be helpful for selected patients, particularly for metabolic concerns, but it is not required for everyone with PCOS.

7. Which fertility treatment is best for PCOS?

There is no single best treatment for everyone. For anovulatory infertility without other identified infertility factors, letrozole is recommended as first-line pharmacological ovulation induction in established international guidance. Other treatments, including gonadotrophins and IVF, may be considered depending on the clinical situation.

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Medical Disclaimer: This article is intended for general educational purposes and is not a substitute for professional medical advice, diagnosis, or treatment. PCOS symptoms and treatment needs vary between individuals. Consult a qualified healthcare professional for personalised guidance. The terminology and guideline details should be checked against current authoritative medical sources before publication.